It is not well known but Capture NX can be used for many portrait retouching purposes. In the example above, I reduced the dark circles under the eyes, changed the eye and lip colors, and removed the reflections on the nose and face.

I am working on it. In summary, use colorize and Gaussian blur to reduce dark circles and use LCH to change colors. In both cases, use the selection brush to selectively apply the effect. It works best with a pen tablet such as Wacom Intous 3.